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72 lines
2.1 KiB
72 lines
2.1 KiB
/** |
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* @fileoverview Rule to flag labels that are the same as an identifier |
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* @author Ian Christian Myers |
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*/ |
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"use strict"; |
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//------------------------------------------------------------------------------ |
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// Requirements |
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//------------------------------------------------------------------------------ |
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const astUtils = require("./utils/ast-utils"); |
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//------------------------------------------------------------------------------ |
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// Rule Definition |
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//------------------------------------------------------------------------------ |
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module.exports = { |
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meta: { |
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type: "suggestion", |
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docs: { |
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description: "disallow labels that share a name with a variable", |
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category: "Variables", |
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recommended: false, |
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url: "https://eslint.org/docs/rules/no-label-var" |
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}, |
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schema: [] |
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}, |
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create(context) { |
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//-------------------------------------------------------------------------- |
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// Helpers |
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//-------------------------------------------------------------------------- |
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/** |
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* Check if the identifier is present inside current scope |
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* @param {Object} scope current scope |
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* @param {string} name To evaluate |
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* @returns {boolean} True if its present |
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* @private |
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*/ |
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function findIdentifier(scope, name) { |
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return astUtils.getVariableByName(scope, name) !== null; |
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} |
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//-------------------------------------------------------------------------- |
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// Public API |
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//-------------------------------------------------------------------------- |
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return { |
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LabeledStatement(node) { |
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// Fetch the innermost scope. |
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const scope = context.getScope(); |
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/* |
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* Recursively find the identifier walking up the scope, starting |
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* with the innermost scope. |
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*/ |
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if (findIdentifier(scope, node.label.name)) { |
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context.report({ node, message: "Found identifier with same name as label." }); |
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} |
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} |
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}; |
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} |
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};
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